cross tab report is slow in oracle xml publisher

Dear Gurus,

I have developed a matrix report in XML publisher RTF template, my problem is when the number of record is more then report is taking time to format the data as per the tags used to make a matrix output but if i remove those tag and simple making this as a tabular report then it is not taking much time.

Is there any to overcome this problem or some best practices to follow.

below are the tags that i have used.

for row:

<?for-each-group@cell://XXREPORTVO;./EName?><xsl:sort select="current-group()/SortOrder" data-type="number" order="ascending"/>

for cell: